docs: def enrich_rnas_with_genes(graph):
      """Add the corresponding gene node for each RNA/miRNA node and connect them with a transcription edge.
  
      :param pybel.BELGraph graph: A BEL graph
      """
      for rna_node in list(graph):
          if rna_node[FUNCTION] not in {MIRNA, RNA} or FUSION in rna_node or VARIANTS in rna_node:
              continue
  
          gene_node = rna_node.get_gene()
          graph.add_transcription(gene_node, rna_node)